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Push vacuum syringe filled with degassed
water into the tube on the refilling
attachment. Pull plunger until the
plunger stoppers snap in. The pressure
shown on the screen must reach a
vacuum value equal to the atmospheric
air pressure minus 20 hPa (2 kPa).
If this value can be reached the sensor unit
is ready to measure after about 3 hours.
Note
If the vacuum value does not reach a pressure equal to the atmospheric air pressure minus
20 hPa (2 kPa), then there is most likely:
•
a dead volume in the syringe,
•
air in the tube
•
or a leakage in the system (e.g. between the sensor unit and the attachment)
After you have fixed the problem you need to degas the system again.
40 | Preparing the measurement
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